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This is another hypothesis question.

7.3-15. This is another hypothesis question.
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Statistics and Probability-8084678.doc

Solution:
Null Hypothesis (Ho): µx ­ µy = 0
Alternative Hypothesis (Ha): µx ­ µy > 0
Test statistics
Z = (X­bar1 – X­bar2)/ √s1²/n1 + s2²/n2 = (8.10 – 8.07)/ √0.117²/90 +...

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